I belong to a Methodist church because it is the closest, which is the NT basis for church formation--originally in houses.
I also belong to a Baptist Church, because that is how I was raised and the denomination in which I was ordained, but it is rather far away.
I also belong to a Bible Church, because it had the best Sunday teaching I could find for awhile, but it is also rather far for attending frequently.
About the time I graduated from High School I realized that I only knew how salvation worked and needed to learn more black box doctrines in order to become a stronger Christian and better witness as my introverted personality allowed.
By reading the Bible through in four translations and taking notes in the margins to connect dots I learned a lot, augmented by seminary classes required for becoming a degreed minister and chaplain.
At this point in my life, as I continue to LGW my main ministry is passing on the results of my good fight via our website and CC before I pass on, which might not be for a few years, but we should always be ready.
You raise an interesting question - the knowability of what we are terming “black box” doctrines. Certainly some black boxes can be safely opened and understood by suitably qualified engineers. Others are intended to be for the manufacturer only.
I still attend both a Methodist aligned and a Calvin aligned fellowship. I became a Christian in 1982 and have heard a variety of views.
Like you, my preferred fellowship is the one that takes place in relationships with others in homes. God bless!!